Anisotropic overall and internal motions of short DNA fragments.

Abstract:

:Anisotropic motions of DNA fragments in the size range 6-118 base pairs are studied by the steady-state fluorescence polarization of different excitation transitions in the intercalated ethidium cation. Calculated effective tumbling and twisting times are found to be shorter than predicted for overall motions of rigid DNA, indicating that internal motions and/or dye wobbling contribute to the depolarization. The data are consistent with a model where the DNA fragments are considered to be rigid against bending but torsionally flexible, and where the dye can wobble within the intercalated site. We also discuss the possibility of correlated out-of-plane motions of the dye and the DNA bases.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Härd T,Kearns DR

doi

10.1093/nar/14.9.3945

subject

Has Abstract

pub_date

1986-05-12 00:00:00

pages

3945-56

issue

9

eissn

0305-1048

issn

1362-4962

journal_volume

14

pub_type

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